Results for "Graciela Nasini"

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Some advances on the set covering polyhedron of circulant matricesMay 28 2012Working on the set covering polyhedron of consecutive ones circulant matrices, Argiroffo and Bianchi found a class of facet defining inequalities, induced by a particular family of circulant minors. In this work we extend these results to inequalities ... More
An exact DSatur-based algorithm for the Equitable Coloring ProblemMay 27 2014This paper describes an exact algorithm for the Equitable Coloring Problem, based on the well known DSatur algorithm for the classic Coloring Problem with new pruning rules specifically derived from the equity constraint. Computational experiences show ... More
A DSATUR-based algorithm for the Equitable Coloring ProblemJun 07 2013May 27 2014This paper describes a new exact algorithm for the Equitable Coloring Problem, a coloring problem where the sizes of two arbitrary color classes differ in at most one unit. Based on the well known DSatur algorithm for the classic Coloring Problem, a new ... More
Polyhedral results for the Equitable Coloring ProblemJun 16 2011In this work we study the polytope associated with a 0/1 integer programming formulation for the Equitable Coloring Problem. We find several families of valid inequalities and derive sufficient conditions in order to be facet-defining inequalities. We ... More
On dominating set polyhedra of circular interval graphsDec 19 2017Feb 20 2018Clique-node and closed neighborhood matrices of circular interval graphs are circular matrices. The stable set polytope and the dominating set polytope on these graphs are therefore closely related to the set packing polytope and the set covering polyhedron ... More
Circuits and circulant minorsFeb 08 2019Circulant contraction minors play a key role for characterizing ideal circular matrices in terms of minimally non ideal structures. In this article we prove necessary and sufficient conditions for a circular matrix $A$ to have circulant contraction minors ... More
The Minor inequalities in the description of the Set Covering Polyhedron of Circulant MatricesJun 06 2012In this work we give a complete description of the set covering polyhedron of circulant matrices $C^k_{sk}$ with $s = 2,3$ and $k\geq 3 $ by linear inequalities. In particular, we prove that every non boolean facet defining inequality is associated with ... More
Grundy dominating sequences on $X$-join productOct 05 2018In this paper we study the Grundy domination number on the $X$-join product $G\hookleftarrow \mathcal R$ of a graph $G$ and a family of graphs $\mathcal R=\{G_v: v\in V(G)\}$. The results led us to extend the few known families of graphs where this parameter ... More
The Identifying Code problem on $P_4$-tidy graphsDec 14 2013Dec 09 2014In this paper we first analyze the behaviour of the identifying code number under union and join operations in graphs. This study forced us to analyze three new parameters related to identifying codes, dominating sets and total dominating sets of the ... More
A tabu search heuristic for the Equitable Coloring ProblemMay 27 2014The Equitable Coloring Problem is a variant of the Graph Coloring Problem where the sizes of two arbitrary color classes differ in at most one unit. This additional condition, called equity constraints, arises naturally in several applications. Due to ... More
A polyhedral approach for the Equitable Coloring ProblemJun 16 2011Nov 01 2011In this work we study the polytope associated with a 0,1-integer programming formulation for the Equitable Coloring Problem. We find several families of valid inequalities and derive sufficient conditions in order to be facet-defining inequalities. We ... More
A Branch and Price Algorithm for List Coloring ProblemNov 30 2018Coloring problems in graphs have been used to model a wide range of real applications. In particular, the List Coloring Problem generalizes the well-known Graph Coloring Problem for which many exact algorithms have been developed. In this work, we present ... More
On the Packing Chromatic Number on Hamming Graphs and General GraphsOct 19 2015The packing chromatic number $\chi_\rho(G)$ of a graph $G$ is the smallest integer $k$ needed to proper color the vertices of $G$ in such a way the distance between any two vertices having color $i$ be at least $i+1$. We obtain $\chi_\rho(H_{q,m})$ for ... More
Lovász-Schrijver PSD-operator on Claw-Free GraphsDec 06 2016The subject of this work is the study of $\LS_+$-perfect graphs defined as those graphs $G$ for which the stable set polytope $\stab(G)$ is achieved in one iteration of Lov\'asz-Schrijver PSD-operator $\LS_+$, applied to its edge relaxation $\estab(G)$. ... More
Total dominating sequences in trees, split graphs, and under modular decompositionAug 24 2016A sequence of vertices in a graph $G$ with no isolated vertices is called a total dominating sequence if every vertex in the sequence totally dominates at least one vertex that was not totally dominated by preceding vertices in the sequence, and, at the ... More
Beyond the Standard ModelJul 20 1993These are three lectures given at the ``Lake Louise Winter Institute", (Lake Louise Canada, Feb 1993). A pedagogical introduction is given to attempts to formulate a more fundamental theory of elementary particles than that provided by the standard model. ... More
Characterizing N+-perfect line graphsMay 15 2015The subject of this contribution is the study of the Lov\'asz-Schrijver PSD-operator N+ applied to the edge relaxation of the stable set polytope of a graph. We are particularly interested in the problem of characterizing graphs for which N+ generates ... More
BioSimplify: an open source sentence simplification engine to improve recall in automatic biomedical information extractionJul 28 2011BioSimplify is an open source tool written in Java that introduces and facilitates the use of a novel model for sentence simplification tuned for automatic discourse analysis and information extraction (as opposed to sentence simplification for improving ... More
Cosmic rays above the ankle from Z-burstsJan 29 2002Jun 24 2002Neutrinos from far away sources annihilating at the Z resonance on relic neutrinos may give origin to the ultrahigh-energy cosmic rays. Here we present predictions of this mechanism with relic neutrinos lighter than 1 eV, which do not gravitationally ... More
DAMA detection claim is still compatible with all other DM searchesDec 20 2005We show that the annual modulation signal observed by DAMA can be reconciled with all other negative results from dark matter searches with a conventional halo model for particle masses around 5 to 9 GeV. We also show which particular dark matter stream ... More
Cosmology of "Visible" Sterile NeutrinosDec 21 2004We point out that in scenarios with a low reheating temperature $T_R << 100$ MeV at the end of (the last episode of) inflation or entropy production, the abundance of sterile neutrinos becomes largely independent of their coupling to active neutrinos. ... More
Dark matter searches: looking for the cake or its frosting? (Detectability of a subdominant component of the CDM)Oct 01 2003The dark matter candidates we are searching for, e.g. neutralinos, may be one of many components of the cold dark matter (CDM). We point out here that very subdominant components, constituting even 1% of the CDM for indirect detection and much less for ... More
Fuzzy Propositional Logic Associated with Quantum Computational GatesDec 26 2006We apply residuated structures associated with fuzzy logic to develop certain aspects of information processing in quantum computing from a logical perspective. For this purpose, we introduce an axiomatic system whose natural interpretation is the irreversible ... More
TASI 2014 Lectures: The Hunt for Dark MatterFeb 04 2015Jun 10 2015These lectures, given at the 2014 Theoretical Advanced Study Institute (TASI), are an introduction to what we know at present about dark matter and the major current experimental and observational efforts to identify what it consists of. They attempt ... More
Direct Dark Matter Searches: Fits to WIMP CandidatesJun 30 2011After a brief introduction to dark matter in general and to WIMPs as candidates, we review recent results of direct dark matter searches. We concentrate on older and more recent hints pointing to light WIMP's with mass below 10 GeV.
DM production mechanismsSep 20 2010We review the mechanism of production of dark matter particles in the early Universe, both in standard and non-standard pre-Big Bang Nucleosynthesis cosmologies. We concentrate mostly on the production of WIMPs.
Search for Dark MatterOct 21 2008The search for dark matter is a very wide an active field of research, and I necessarily concentrate here only in some aspects of it. I will review the prospects for direct and indirect dark matter searches of Weakly Interacting Massive Particles in the ... More
Experimental relevance of low reheating temperature cosmologiesMay 13 2008Standard simple assumptions are usually made about the pre-Big Bang Nucleosynthesis epoch, from which we do not have observations. Modifying these assumptions, the predicted density of relic particles such as neutralinos and sterile neutrinos can be very ... More
A discussion on particle number and quantum indistinguishabilityMay 23 2007The concept of individuality in quantum mechanics shows radical differences from the concept of individuality in classical physics, as E. Schroedinger pointed out in the early steps of the theory. Regarding this fact, some authors suggested that quantum ... More
DAMA Dark Matter Detection Compatible with Other SearchesMay 27 2004We present two examples of velocity distributions for light dark matter particles that reconcile the annual modulation signal observed by DAMA with all other negative results from dark matter searches. They are: (1) a conventional Maxwellian distribution ... More
Super-Kamiokande 0.07 eV Neutrinos in Cosmology: Hot Dark Matter and the Highest Energy Cosmic RaysMay 25 2000Relic neutrinos with mass in the range indicated by Super-Kamiokande results if neutrino masses are hierarchial (about 0.07 eV) are many times deemed too light to be cosmologically relevant. Here we remark that these neutrinos may significantly contribute ... More
Fits to Light WIMPsSep 03 2012We review fits to "light WIMPs" since the region was first mentioned relative to the DAMA collaboration data in 2003 to the present, analyzing the compatibility of potential signals and bounds in this region. We include dark halo independent data comparisons. ... More
High energy cosmic raysMar 26 2009I review here some of the physics we are learning and expect to learn in the near future through the observation of cosmic rays. The study of cosmic rays involves a combination of data from accelerators, ground arrays, atmospheric fluorescence detectors ... More
Strange Baryonic Matter from Chiral Effective LagrangiansOct 26 1996Nov 01 1996We investigate the existence of bound states of baryons in a kaon condensate using chiral mean field theory. The interactions are described by an effective SU(3)_L X SU(3)_R chiral lagrangian where terms of higher order in density, baryon momentum, and ... More
Contextual logic for quantum systemsFeb 02 2007In this work we build a quantum logic that allows us to refer to physical magnitudes pertaining to different contexts from a fixed one without the contradictions with quantum mechanics expressed in no-go theorems. This logic arises from considering a ... More
Halo-Independent analysis of direct dark matter detection data for any WIMP interactionNov 04 2014The halo independent comparison of direct dark matter detection data eliminates the need to make any assumption on the uncertain local dark matter distribution and is complementary to the usual data comparison which required assuming a dark halo model ... More
Light weakly interacting massive particlesDec 29 2016Dec 03 2017Light WIMPs are dark matter particle candidates with weak scale interaction with the known particles, and mass in the GeV to 10's of GeV range. Hints of light WIMPs have appeared in several dark matter searches in the last decade. The unprecedented possible ... More
Ion-Channeling in Direct Dark Matter Crystalline DetectorsDec 17 2010The channeling of the recoiling nucleus in crystalline detectors after a WIMP collision would produce a larger scintillation or ionization signal in direct detection experiments than otherwise expected. I present estimates of the importance of this effect ... More
Relevance of Ion-Channeling for Direct DM DetectionOct 16 2009The channeling of the recoiling nucleus in crystalline detectors after a WIMP collision would produce a larger scintillation or ionization signal in direct detection experiments than otherwise expected. I present estimates of the importance of this effect ... More
GZK photons as UHECR above 10$^{19}$ eVDec 20 2005"GZK photons" are produced by extragalactic nucleons through the resonant photoproduction of pions. We present the expected range of the GZK photon fraction of UHECR, assuming a particular UHECR spectrum and primary nucleons, and compare it with the minimal ... More
Highest-energy cosmic rays from Fermi-degenerate relic neutrinos consistent with Super-Kamiokande resultsFeb 16 1999May 17 1999Relic neutrinos with mass 0.07 (+0.02/-0.04) eV, in the range consistent with Super-Kamiokande data, can explain the cosmic rays with energies in excess of the Greisen-Zatsepin-Kuzmin cutoff. The spectrum of ultra-high energy cosmic rays produced in this ... More
Neutrino MassesDec 12 1994This is a review for Reports of Progress in Physics. After an introduction we start by explaining the different neutrino masses corresponding to different types of neutrinos, Dirac or Majorana, in section 2. In section 3 we discuss the main elementary ... More
Compatibility of DAMA Dark Matter Detection with Other SearchesApr 02 2005Aug 11 2005We present two examples of velocity distributions for light dark matter particles that reconcile the annual modulation signal observed by DAMA with all other negative results from dark matter searches. They are: (1) a conventional Maxwellian distribution ... More
Unstable superheavy relic particles as a source of neutrinos responsible for the ultrahigh-energy cosmic raysAug 05 1999Feb 17 2000Decays of superheavy relic particles may produce extremely energetic neutrinos. Their annihilations on the relic neutrinos can be the origin of the cosmic rays with energies beyond the Greisen-Zatsepin-Kuzmin cutoff. The red shift acts as a cosmological ... More
Chiral Effective Lagrangian Description of Bulk Nuclear MatterMar 31 1995Here we point out that the four-nucleon terms incorporate into lowest order non-linear chiral effective Lagrangians the same description of bulk nuclear matter contained in the Walecka model, that is generally considered satisfactory. We find this point ... More
Marginal integration $M-$estimators for additive modelsSep 14 2015Additive regression models have a long history in multivariate nonparametric regression. They provide a model in which each regression function depends only on a single explanatory variable allowing to obtain estimators at the optimal univariate rate. ... More
Quantum computational logic with mixed statesFeb 26 2010Using an algebraic framework we solve a problem posed in [5] and [7] about the axiomatizability of a quantum computational type logic related to fuzzy logic. A Hilbert-style calculus is developed obtaining an algebraic strong completeness theorem.
Neutralino with the Right Cold Dark Matter Abundance in (Almost) Any Supersymmetric ModelFeb 24 2006We consider non-standard cosmological models in which the late decay of a scalar field $\phi$ reheats the Universe to a low reheating temperature, between 5 MeV and the standard freeze-out temperature of neutralinos of mass $m_{\chi}$. We point out that ... More
Remarks on Ruled surfaces and rank two bundles with canonical determinant and 4 sectionsNov 15 2014Mar 25 2015Let $C$ be a smooth irreducible complex projective curve of genus $g$ and let $B^k(2,K_C)$ be the Brill-Noether loci parametrizing classes of (semi)-stable vector bundles $E$ of rank two with canonical determinant over $C$ with $h^0(C,E)\geq k$. We show ... More
A joint model for authors characteristics and collaboration pattern in bibliometric networks: a Bayesian approachAug 23 2015Demographic and behavioral characteristics of journal authors are important indicators of homophily in co-authorship networks. In the presence of correlations between adjacent nodes (assortative mixing), combining the estimation of the individual characteristics ... More
Bartering integer commodities with exogenous pricesJan 14 2014Aug 09 2015The analysis of markets with indivisible goods and fixed exogenous prices has played an important role in economic models, especially in relation to wage rigidity and unemployment. This research report provides a mathematical and computational details ... More
Lovász-Schrijver SDP-operator, near-perfect graphs and near-bipartite graphsNov 08 2014We study the Lov\'asz-Schrijver lift-and-project operator ($LS_+$) based on the cone of symmetric, positive semidefinite matrices, applied to the fractional stable set polytope of graphs. The problem of obtaining a combinatorial characterization of graphs ... More
Effects of kination and scalar-tensor cosmologies on sterile neutrinosFeb 04 2014Jun 19 2014We study the effects of kination and scalar-tensor pre-Big Bang Nucleosynthesis cosmologies on the non-resonant production of sterile neutrinos. We show that if the peak of the production rate of sterile neutrinos occurs during the non-standard cosmological ... More
Oscillating delayed feedback control schemes for stabilizing equilibrium pointsMay 23 2018Limitations of the delayed feedback control and of its extended versions have been fully treated in the literature. The oscillating delayed feedback control appears as a promising scheme to overcome this problem. In this work, two methods based on oscillatory ... More
Controlling Chaotic Maps by Feedback Control ModulationMay 22 2016This paper deals whith the stabilization of any UPO of a chaotic map by modulation of a control parameter. It concentrates on proportional and delayed feedback control methods. Alternative types of these methods are proposed and their achievments are ... More
An unsupervised and customizable misspelling generator for mining noisy health-related text sourcesJun 04 2018In this paper, we present a customizable datacentric system that automatically generates common misspellings for complex health-related terms. The spelling variant generator relies on a dense vector model learned from large unlabeled text, which is used ... More
Halo independent comparison of direct dark matter detection dataFeb 28 2012Sep 07 2012We extend the halo-independent method of Fox, Liu, and Weiner to include energy resolution and efficiency with arbitrary energy dependence, making it more suitable for experiments to use in presenting their results. Then we compare measurements and upper ... More
An stratification of $B^4(2,K_C)$ over a general curveJul 06 2017For a general curve C of genus $g\geq 10$, we show that the Brill- Noether locus $B^4(2,K_C)$ contains irreducible sub-varieties $B_3\supset B_4 \supset \cdots \supset B_n$, where $B_n$ is of dimension $3g-10-n$ and $B_3$ is an irreducible component of ... More
Ultra-cold WIMPs: relics of non-standard pre-BBN cosmologiesMar 17 2008Aug 20 2008Weakly interacting massive particles (WIMPs) are one of very few probes of cosmology before Big Bang nucleosynthesis (BBN). We point out that in scenarios in which the Universe evolves in a non-standard manner during and after WIMP kinetic decoupling, ... More
Aberration features in directional dark matter detectionMay 10 2012Jul 11 2012The motion of the Earth around the Sun causes an annual change in the magnitude and direction of the arrival velocity of dark matter particles on Earth, in a way analogous to aberration of stellar light. In directional detectors, aberration of weakly ... More
Channeling in direct dark matter detection II: channeling fraction in Si and Ge crystalsAug 22 2010Nov 03 2010The channeling of the ion recoiling after a collision with a WIMP changes the ionization signal in direct detection experiments, producing a larger signal than otherwise expected. We give estimates of the fraction of channeled recoiling ions in Si and ... More
Channeling in solid Xe, Ar and Ne direct dark matter detectorsNov 27 2010Jun 14 2011The channeling of the ion recoiling after a collision with a WIMP changes the ionization signal in direct detection experiments, producing a larger scintillation or ionization signal than otherwise expected. We give estimates of the fraction of channeled ... More
Experimental identification of non-pointlike dark-matter candidatesMar 19 2002Jul 25 2002We show that direct dark matter detection experiments can distinguish between pointlike and non-pointlike dark-matter candidates. The shape of the nuclear recoil energy spectrum from pointlike dark-matter particles, e.g., neutralinos, is determined by ... More
Prompt atmospheric neutrinos and muons: NLO vs LO QCD predictionsApr 26 1999We compare the leading and next-to-leading order QCD predictions for the flux of atmospheric muons and neutrinos from decays of charmed particles. We find that the full NLO lepton fluxes can be approximated to within 10% by the Born--level fluxes multiplied ... More
On photon splitting in theories with Lorentz invariance violationMar 14 2005May 23 2005In a model with Lorentz invariance violation implemented through modified dispersion relations, we estimate the rate for the decay process gamma -> 3 gamma and find that it provides a relevant bound on Lorentz invariance violation.
Determining the number of factors in a forecast model by a random matrix test: cryptocurrenciesMay 02 2019We determine the number of statistically significant factors in a forecast model using a random matrices test. The applied forecast model is of the type of Reduced Rank Regression (RRR), in particular, we chose a flavor which can be seen as the Canonical ... More
A test for the equality of covariance operatorsApr 28 2014In many situations, when dealing with several populations, equality of the covariance operators is assumed. An important issue is to study if this assumption holds before making other inferences. In this paper, we develop a test for comparing covariance ... More
The Paraná Ra'anga expeditionJun 19 2013Paran\'a Ra'anga (the image of Paran\'a, in Guaran\'i) is the name of a cultural and scientific expedition that traveled the rivers: R\'io de la Plata, Paran\'a and Paraguay, from Buenos Aires to Asunci\'on, during March 2010. The project brought together ... More
Daily modulation due to channeling in direct dark matter crystalline detectorsJan 14 2011Jun 20 2011The channeling of the ion recoiling after a collision with a WIMP in direct dark matter crystalline detectors produces a larger scintillation or ionization signal than otherwise expected. Channeling is a directional effect which depends on the velocity ... More
Channeling in direct dark matter detection I: channeling fraction in NaI (Tl) crystalsJun 15 2010Nov 03 2010The channeling of the ion recoiling after a collision with a WIMP changes the ionization signal in direct detection experiments, producing a larger signal than otherwise expected. We give estimates of the fraction of channeled recoiling ions in NaI (Tl) ... More
Towards Automatic Extraction of Social Networks of Organizations in PubMed AbstractsJan 24 2010Mar 17 2010Social Network Analysis (SNA) of organizations can attract great interest from government agencies and scientists for its ability to boost translational research and accelerate the process of converting research to care. For SNA of a particular disease ... More
Detectability of a subdominant density component of cold dark matterFeb 15 2001Jun 21 2001Here we examine the detectability of collisionless dark matter candidates that may constitute not all but only a subdominant component of galactic cold dark matter. We show that current axion searches are not suited for a subdominant component, while ... More
Prompt atmospheric neutrinos and muons: dependence on the gluon distribution functionMay 17 1999We compute the next-to-leading order QCD predictions for the vertical flux of atmospheric muons and neutrinos from decays of charmed particles, for different PDF's (MRS-R1, MRS-R2, CTEQ-4M and MRST) and different extrapolations of these at small partonic ... More
Robust estimators in a generalized partly linear regression model under monotony constraintsFeb 22 2018Nov 29 2018In this paper, we consider the situation in which the observations follow an isotonic generalized partly linear model. Under this model, the mean of the responses is modelled, through a link function, linearly on some covariates and nonparametrically ... More
Particle-Antiparticle Asymmetry Due to Non-Renormalizable Effective InteractionsFeb 12 1996We consider a model for generating a particle-antiparticle asymmetry through out-of-equilibrium decays of a massive particle due to non-renormalizable, effective interactions.
Robust estimates in generalized partially linear modelsAug 01 2007In this paper, we introduce a family of robust estimates for the parametric and nonparametric components under a generalized partially linear model, where the data are modeled by $y_i|(\mathbf{x}_i,t_i)\sim F(\cdot,\mu_i)$ with $\mu_i=H(\eta(t_i)+\mathbf{x}_i^{$\mathrm{T}$}\beta)$, ... More
The spatial sign covariance operator: Asymptotic results and applicationsApr 11 2018Due to the increasing recording capability, functional data analysis has become an important research topic. For functional data the study of outlier detection and/or the development of robust statistical procedures has started recently. One robust alternative ... More
Robust estimation in single index models when the errors have a unimodal density with unknown nuisance parameterSep 15 2017Jan 24 2018In this paper, we propose a robust profile estimation method for the parametric and nonparametric components of a single index model when the errors have a strongly unimodal density with unknown nuisance parameter. Under regularity conditions, we derive ... More
Two-valued states on Baer $^*$-semigroupsJan 06 2014In this paper we develop an algebraic framework that allows us to extend families of two-valued states on orthomodular lattices to Baer $^*$-semigroups. We apply this general approach to study the full class of two-valued states and the subclass of Jauch-Piron ... More
Equational characterization for two-valued states in orthomodular quantum systemsJul 28 2013In this paper we develop an algebraic framework in which several classes of two-valued states over orthomodular lattices may be equationally characterized. The class of two-valued states and the subclass of Jauch-Piron two-valued states are among the ... More
A Topological Study of Contextuality and Modality in Quantum MechanicsDec 29 2006Kochen-Specker theorem rules out the non-contextual assignment of values to physical magnitudes. Here we enrich the usual orthomodular structure of quantum mechanical propositions with modal operators. This enlargement allows to refer consistently to ... More
An optimization problem for nonliear Steklov eigenvalues with a boundary potentialNov 22 2013In this paper, we analyze an optimization problem for the first (nonlinear) Steklov eigenvalue plus a boundary potential with respect to the potential function which is assumed to be uniformly bounded and with fixed $L^1$-norm.
Mining the Web for Pharmacovigilance: the Case Study of Duloxetine and VenlafaxineOct 08 2016Adverse reactions caused by drugs following their release into the market are among the leading causes of death in many countries. The rapid growth of electronically available health related information, and the ability to process large volumes of them ... More
Ring-like features in directional dark matter detectionNov 28 2011May 10 2012We discuss a novel dark matter signature relevant for directional detection of Weakly Interacting Massive Particles (WIMPs). For heavy enough WIMPs and low enough recoil energies, the maximum of the recoil rate is not in the direction of the average WIMP ... More
Updated Constraints on the Dark Matter Interpretation of CDMS-II-Si DataMar 20 2017May 03 2017We present an updated halo-dependent and halo-independent analysis of viable light WIMP dark matter candidates which could account for the excess observed in CDMS-II-Si. We include recent constraints from LUX, PandaX-II, and PICO-60, as well as projected ... More
Channeling in direct dark matter detection III: channeling fraction in CsI crystalsSep 17 2010Nov 03 2010The channeling of the ion recoiling after a collision with a WIMP changes the ionization signal in direct detection experiments, producing a larger signal scintillation or ionization than otherwise expected. We give estimates of the fraction of channeled ... More
Detectability of the Sgr Dwarf Leading Tidal Stream with Auger, EUSO or OWLOct 31 2003Jun 23 2004We point out that if heavy metastable particles composing the dark matter of our galaxy are responsible for the ultra-high energy cosmic rays (UHECR) then the leading tidal stream of the Sagittarius dwarf galaxy could be detected through UHECR. The signal ... More
Bounds on Relic Neutrino Masses in the Z-burst ModelApr 29 2004Neutrinos from far-away sources annihilating at the Z resonance on relic neutrinos may give origin to the extreme-energy cosmic rays (EECR). If ``Z-bursts'' are responsible for the EECR events, then we show that the non-observation of cosmic ray events ... More
Testing equality between several populations covariance operatorsApr 28 2014Nov 18 2016In many situations, when dealing with several populations, equality of the covariance operators is assumed. An important issue is to study if this assumption holds before making other inferences. In this paper, we develop a test for comparing covariance ... More
Hints of Sterile Neutrinos in Recent Measurements of the Hubble ParameterJun 24 2019Local Universe observations find a value of the Hubble constant $H_0$ that is larger than the value inferred from the Cosmic Microwave Background and other early Universe measurements, assuming known physics and the $\Lambda$CDM cosmological model. We ... More
Physical properties as modal operators in the topos approach to quantum mechanicsDec 21 2014In the framework of the topos approach to quantum mechanics we give a representation of physical properties in terms of modal operators on Heyting algebras. It allows us to introduce a classical type study of the mentioned properties.
Scopes and Limits of Modality in Quantum MechanicsDec 29 2006We develop an algebraic frame for the simultaneous treatment of actual and possible properties of quantum systems. We show that, in spite of the fact that the language is enriched with the addition of a modal operator to the orthomodular structure, contextuality ... More
Measuring the prompt atmospheric neutrino flux with down-going muons in neutrino telescopesSep 10 2002In the TeV energy region and above, the uncertainty in the level of prompt atmospheric neutrinos would limit the search for diffuse astrophysical neutrinos. We suggest that neutrino telescopes may provide an empirical determination of the flux of prompt ... More
Measurement of the gluon PDF at small x with neutrino telescopesMar 31 2000Oct 04 2000We analyze the possibility that neutrino telescopes may provide an experimental determination of the slope lambda of the gluon distribution in the proton at momentum fractions x smaller than the accelerator reach. The method is based on a linear relation ... More
Dynamics of Megaelectron Volt Electrons Observed in the Inner Belt by PROBA-V/EPTMar 28 2019Using the observations of the EPT (Energetic Particle Telescope) onboard the satellite PROBA-V we study the dynamics of inner and outer belt electrons from 500 keV to 8 MeV during quiet periods and geomagnetic storms. This high time-resolution (2 sec) ... More
The square of opposition in orthomodular logicApr 23 2014In Aristotelian logic, categorical propositions are divided in Universal Affirmative, Universal Negative, Particular Affirmative and Particular Negative. Possible relations between two of the mentioned type of propositions are encoded in the square of ... More
Interpreting the modal Kochen-Specker theorem: possibility and many worlds in quantum mechanicsApr 23 2014In this paper we attempt to physically interpret the Modal Kochen- Specker (MKS) theorem. In order to do so, we analyze the features of the possible properties of quantum systems arising from the elements in an orthomodular lattice and distinguish the ... More
The Contextual Character of Modal Interpretations of Quantum MechanicsMay 11 2007In this article we discuss the contextual character of quantum mechanics in the framework of modal interpretations. We investigate its historical origin and relate contemporary modal interpretations to those proposed by M. Born and W. Heisenberg. We present ... More
Geoneutrinos in Large Direct Detection ExperimentsDec 13 2018Dec 21 2018Geoneutrinos can provide a unique insight into Earth's interior, its central engine and its formation history. We study the detection of geoneutrinos in large direct detection experiments, which has been considered non-feasible. We compute the geoneutrino-induced ... More
Social media mining for identification and exploration of health-related information from pregnant womenFeb 08 2017Widespread use of social media has led to the generation of substantial amounts of information about individuals, including health-related information. Social media provides the opportunity to study health-related information about selected population ... More